/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.linkis.engineconnplugin.flink.client.sql.operation.impl;

import org.apache.linkis.engineconnplugin.flink.client.context.ExecutionContext;
import org.apache.linkis.engineconnplugin.flink.client.sql.operation.NonJobOperation;
import org.apache.linkis.engineconnplugin.flink.client.sql.operation.OperationUtil;
import org.apache.linkis.engineconnplugin.flink.client.sql.operation.result.ConstantNames;
import org.apache.linkis.engineconnplugin.flink.client.sql.operation.result.ResultSet;
import org.apache.linkis.engineconnplugin.flink.context.FlinkEngineConnContext;
import org.apache.linkis.engineconnplugin.flink.exception.SqlExecutionException;

import org.apache.flink.table.api.TableEnvironment;

import java.util.Arrays;
import java.util.List;

/** Operation for SHOW CATALOGS command. */
public class ShowCatalogsOperation implements NonJobOperation {
  private final ExecutionContext context;

  public ShowCatalogsOperation(FlinkEngineConnContext context) {
    this.context = context.getExecutionContext();
  }

  @Override
  public ResultSet execute() throws SqlExecutionException {
    final TableEnvironment tableEnv = context.getTableEnvironment();
    final List<String> catalogs =
        context.wrapClassLoader(() -> Arrays.asList(tableEnv.listCatalogs()));
    return OperationUtil.stringListToResultSet(catalogs, ConstantNames.SHOW_CATALOGS_RESULT);
  }
}
